1 | /* |
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2 | * console.c |
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3 | * |
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4 | * This file contains the Sparc Instruction Simulator Console driver. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1997. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * Ported to ERC32 implementation of the SPARC by On-Line Applications |
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15 | * Research Corporation (OAR) under contract to the European Space |
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16 | * Agency (ESA). |
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17 | * |
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18 | * ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995. |
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19 | * European Space Agency. |
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20 | * |
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21 | * $Id$ |
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22 | */ |
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23 | |
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24 | #include <bsp.h> |
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25 | #include <rtems/libio.h> |
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26 | #include <stdlib.h> |
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27 | |
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28 | /* |
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29 | * Define RDB_BREAK_IN if you need to be able to break in to the |
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30 | * program with a ctrl-c during remote target debugging. If so, |
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31 | * UART B will not be accessible from rtems during remote debugging |
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32 | * if interrupt driven console is used. Does not affect UART A, polled |
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33 | * mode or when the program runs without remote debugging. |
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34 | */ |
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35 | |
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36 | #define RDB_BREAK_IN |
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37 | |
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38 | /* |
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39 | * Should we use a polled or interrupt drived console? |
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40 | * |
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41 | * NOTE: Define only one of these by default. |
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42 | * |
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43 | * WARNING: As of sis 1.6, it did not appear that the UART interrupts |
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44 | * worked in a desirable fashion. Immediately upon writing |
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45 | * a character into the TX buffer, an interrupt was generated. |
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46 | * This did not allow enough time for the program to put more |
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47 | * characters in the buffer. So every character resulted in |
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48 | * "priming" the transmitter. This effectively results in |
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49 | * in a polled console with a useless interrupt per character |
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50 | * on output. It is reasonable to assume that input does not |
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51 | * share this problem although it was not investigated. |
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52 | */ |
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53 | |
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54 | #ifdef CONSOLE_USE_POLLED |
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55 | #define OUTBYTE console_outbyte_polled |
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56 | #define INBYTE console_inbyte_polled |
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57 | #else |
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58 | #define OUTBYTE console_outbyte_interrupts |
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59 | #define INBYTE console_inbyte_interrupts |
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60 | #endif |
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61 | |
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62 | void console_initialize_interrupts( void ); |
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63 | |
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64 | /* console_initialize |
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65 | * |
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66 | * This routine initializes the console IO driver. |
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67 | * |
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68 | * Input parameters: |
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69 | * major - console device major number |
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70 | * minor - console device minor number |
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71 | * arg - pointer to optional device driver arguments |
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72 | * |
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73 | * Output parameters: NONE |
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74 | * |
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75 | * Return values: |
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76 | * rtems_device_driver status code |
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77 | */ |
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78 | |
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79 | rtems_device_driver console_initialize( |
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80 | rtems_device_major_number major, |
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81 | rtems_device_minor_number minor, |
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82 | void *arg |
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83 | ) |
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84 | { |
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85 | rtems_status_code status; |
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86 | |
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87 | status = rtems_io_register_name( |
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88 | "/dev/console", |
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89 | major, |
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90 | (rtems_device_minor_number) 0 |
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91 | ); |
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92 | |
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93 | if (status != RTEMS_SUCCESSFUL) |
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94 | rtems_fatal_error_occurred(status); |
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95 | |
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96 | #ifdef CONSOLE_USE_INTERRUPTS |
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97 | console_initialize_interrupts(); |
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98 | #endif |
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99 | |
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100 | return RTEMS_SUCCESSFUL; |
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101 | } |
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102 | |
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103 | /* console_inbyte_polled |
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104 | * |
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105 | * This routine reads a character from the UART. |
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106 | * |
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107 | * Input parameters: |
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108 | * port - port to read character from |
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109 | * |
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110 | * Output parameters: NONE |
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111 | * |
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112 | * Return values: |
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113 | * character read from UART |
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114 | */ |
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115 | |
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116 | char console_inbyte_polled( int port ) |
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117 | { |
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118 | int UStat; |
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119 | |
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120 | if ( port == 0 ) { |
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121 | while (((UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRA) == 0 ) |
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122 | if (UStat & ERC32_MEC_UART_STATUS_ERRA) { |
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123 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA; |
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124 | ERC32_MEC.Control = ERC32_MEC.Control; |
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125 | } |
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126 | return (int) ERC32_MEC.UART_Channel_A; |
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127 | } |
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128 | |
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129 | while (((UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRB) == 0 ) |
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130 | if (UStat & ERC32_MEC_UART_STATUS_ERRB) { |
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131 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB; |
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132 | ERC32_MEC.Control = ERC32_MEC.Control; |
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133 | } |
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134 | return (int) ERC32_MEC.UART_Channel_B; |
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135 | } |
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136 | |
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137 | |
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138 | /* console_outbyte_polled |
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139 | * |
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140 | * This routine transmits a character out. |
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141 | * |
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142 | * Input parameters: |
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143 | * port - port to transmit character to |
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144 | * ch - character to be transmitted |
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145 | * |
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146 | * Output parameters: NONE |
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147 | * |
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148 | * Return values: NONE |
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149 | */ |
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150 | |
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151 | void console_outbyte_polled( |
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152 | int port, |
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153 | char ch |
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154 | ) |
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155 | { |
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156 | if ( port == 0 ) { |
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157 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) == 0 ); |
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158 | ERC32_MEC.UART_Channel_A = (int) ch; |
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159 | return; |
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160 | } |
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161 | |
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162 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) == 0 ); |
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163 | ERC32_MEC.UART_Channel_B = (int) ch; |
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164 | } |
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165 | |
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166 | /* |
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167 | * Interrupt driven console IO |
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168 | */ |
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169 | |
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170 | #ifdef CONSOLE_USE_INTERRUPTS |
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171 | |
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172 | /* |
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173 | * Buffers between task and ISRs |
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174 | */ |
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175 | |
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176 | #include <ringbuf.h> |
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177 | |
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178 | Ring_buffer_t TX_Buffer[ 2 ]; |
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179 | Ring_buffer_t RX_Buffer[ 2 ]; |
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180 | boolean Is_TX_active[ 2 ]; |
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181 | |
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182 | /* |
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183 | * console_isr_a |
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184 | * |
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185 | * This routine is the console interrupt handler for Channel A. |
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186 | * |
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187 | * Input parameters: |
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188 | * vector - vector number |
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189 | * |
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190 | * Output parameters: NONE |
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191 | * |
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192 | * Return values: NONE |
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193 | */ |
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194 | |
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195 | rtems_isr console_isr_a( |
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196 | rtems_vector_number vector |
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197 | ) |
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198 | { |
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199 | char ch; |
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200 | int UStat; |
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201 | |
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202 | if ( (UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRA ) { |
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203 | if (UStat & ERC32_MEC_UART_STATUS_ERRA) { |
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204 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA; |
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205 | ERC32_MEC.Control = ERC32_MEC.Control; |
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206 | } |
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207 | ch = ERC32_MEC.UART_Channel_A; |
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208 | if ( !Ring_buffer_Is_full( &RX_Buffer[ 0 ] ) ) |
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209 | Ring_buffer_Add_character( &RX_Buffer[ 0 ], ch ); |
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210 | /* else toss it */ |
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211 | } |
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212 | |
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213 | if ( ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA ) { |
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214 | if ( !Ring_buffer_Is_empty( &TX_Buffer[ 0 ] ) ) { |
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215 | Ring_buffer_Remove_character( &TX_Buffer[ 0 ], ch ); |
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216 | ERC32_MEC.UART_Channel_A = (unsigned32) ch; |
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217 | } else |
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218 | Is_TX_active[ 0 ] = FALSE; |
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219 | } |
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220 | |
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221 | ERC32_Clear_interrupt( ERC32_INTERRUPT_UART_A_RX_TX ); |
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222 | } |
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223 | |
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224 | /* |
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225 | * console_isr_b |
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226 | * |
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227 | * This routine is the console interrupt handler for Channel B. |
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228 | * |
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229 | * Input parameters: |
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230 | * vector - vector number |
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231 | * |
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232 | * Output parameters: NONE |
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233 | * |
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234 | * Return values: NONE |
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235 | */ |
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236 | |
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237 | rtems_isr console_isr_b( |
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238 | rtems_vector_number vector |
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239 | ) |
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240 | { |
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241 | char ch; |
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242 | int UStat; |
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243 | |
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244 | if ( (UStat = ERC32_MEC.UART_Status) & ERC32_MEC_UART_STATUS_DRB ) { |
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245 | if (UStat & ERC32_MEC_UART_STATUS_ERRB) { |
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246 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB; |
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247 | ERC32_MEC.Control = ERC32_MEC.Control; |
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248 | } |
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249 | ch = ERC32_MEC.UART_Channel_B; |
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250 | if ( !Ring_buffer_Is_full( &RX_Buffer[ 1 ] ) ) |
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251 | Ring_buffer_Add_character( &RX_Buffer[ 1 ], ch ); |
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252 | /* else toss it */ |
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253 | } |
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254 | |
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255 | if ( ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB ) { |
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256 | if ( !Ring_buffer_Is_empty( &TX_Buffer[ 1 ] ) ) { |
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257 | Ring_buffer_Remove_character( &TX_Buffer[ 1 ], ch ); |
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258 | ERC32_MEC.UART_Channel_B = (unsigned32) ch; |
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259 | } else |
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260 | Is_TX_active[ 1 ] = FALSE; |
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261 | } |
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262 | |
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263 | ERC32_Clear_interrupt( ERC32_INTERRUPT_UART_B_RX_TX ); |
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264 | } |
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265 | |
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266 | /* |
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267 | * console_exit |
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268 | * |
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269 | * This routine allows the console to exit by masking its associated interrupt |
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270 | * vectors. |
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271 | * |
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272 | * Input parameters: NONE |
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273 | * |
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274 | * Output parameters: NONE |
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275 | * |
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276 | * Return values: NONE |
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277 | */ |
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278 | |
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279 | void console_exit() |
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280 | { |
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281 | rtems_unsigned32 port; |
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282 | rtems_unsigned32 ch; |
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283 | |
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284 | /* |
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285 | * Although the interrupts for the UART are unmasked, the PIL is set to |
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286 | * disable all external interrupts. So we might as well do this first. |
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287 | */ |
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288 | |
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289 | ERC32_Mask_interrupt( ERC32_INTERRUPT_UART_A_RX_TX ); |
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290 | ERC32_Mask_interrupt( ERC32_INTERRUPT_UART_B_RX_TX ); |
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291 | |
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292 | for ( port=0 ; port <= 1 ; port++ ) { |
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293 | while ( !Ring_buffer_Is_empty( &TX_Buffer[ port ] ) ) { |
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294 | Ring_buffer_Remove_character( &TX_Buffer[ port ], ch ); |
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295 | console_outbyte_polled( port, ch ); |
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296 | } |
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297 | } |
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298 | |
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299 | /* |
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300 | * Now wait for all the data to actually get out ... the send register |
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301 | * should be empty. |
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302 | */ |
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303 | |
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304 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) != |
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305 | ERC32_MEC_UART_STATUS_THEA ); |
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306 | |
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307 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) != |
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308 | ERC32_MEC_UART_STATUS_THEB ); |
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309 | |
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310 | } |
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311 | |
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312 | #define CONSOLE_UART_A_TRAP ERC32_TRAP_TYPE( ERC32_INTERRUPT_UART_A_RX_TX ) |
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313 | #define CONSOLE_UART_B_TRAP ERC32_TRAP_TYPE( ERC32_INTERRUPT_UART_B_RX_TX ) |
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314 | |
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315 | /* |
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316 | * console_initialize_interrupts |
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317 | * |
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318 | * This routine initializes the console's receive and transmit |
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319 | * ring buffers and loads the appropriate vectors to handle the interrupts. |
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320 | * |
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321 | * Input parameters: NONE |
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322 | * |
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323 | * Output parameters: NONE |
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324 | * |
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325 | * Return values: NONE |
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326 | */ |
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327 | |
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328 | #ifdef RDB_BREAK_IN |
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329 | extern unsigned32 trap_table[]; |
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330 | #endif |
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331 | |
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332 | void console_initialize_interrupts() |
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333 | { |
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334 | Ring_buffer_Initialize( &RX_Buffer[ 0 ] ); |
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335 | Ring_buffer_Initialize( &RX_Buffer[ 1 ] ); |
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336 | |
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337 | Ring_buffer_Initialize( &TX_Buffer[ 0 ] ); |
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338 | Ring_buffer_Initialize( &TX_Buffer[ 1 ] ); |
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339 | |
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340 | Is_TX_active[ 0 ] = FALSE; |
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341 | Is_TX_active[ 1 ] = FALSE; |
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342 | |
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343 | atexit( console_exit ); |
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344 | |
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345 | set_vector( console_isr_a, CONSOLE_UART_A_TRAP, 1 ); |
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346 | #ifdef RDB_BREAK_IN |
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347 | if (trap_table[0x150/4] == 0x91d02000) |
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348 | #endif |
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349 | set_vector( console_isr_b, CONSOLE_UART_B_TRAP, 1 ); |
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350 | } |
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351 | |
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352 | /* |
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353 | * console_inbyte_interrupts |
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354 | * |
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355 | * This routine reads a character from the UART. |
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356 | * |
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357 | * Input parameters: NONE |
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358 | * |
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359 | * Output parameters: NONE |
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360 | * |
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361 | * Return values: |
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362 | * character read from UART |
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363 | */ |
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364 | |
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365 | char console_inbyte_interrupts( int port ) |
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366 | { |
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367 | char ch; |
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368 | |
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369 | while ( Ring_buffer_Is_empty( &RX_Buffer[ port ] ) ); |
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370 | |
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371 | Ring_buffer_Remove_character( &RX_Buffer[ port ], ch ); |
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372 | return ch; |
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373 | } |
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374 | |
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375 | /* |
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376 | * console_outbyte_interrupts |
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377 | * |
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378 | * This routine transmits a character out. |
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379 | * |
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380 | * Input parameters: |
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381 | * port - port to transmit character to |
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382 | * ch - character to be transmitted |
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383 | * |
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384 | * Output parameters: NONE |
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385 | * |
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386 | * Return values: NONE |
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387 | */ |
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388 | |
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389 | void console_outbyte_interrupts( |
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390 | int port, |
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391 | char ch |
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392 | ) |
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393 | { |
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394 | /* |
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395 | * If this is the first character then we need to prime the pump |
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396 | */ |
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397 | |
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398 | if ( Is_TX_active[ port ] == FALSE ) { |
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399 | Is_TX_active[ port ] = TRUE; |
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400 | console_outbyte_polled( port, ch ); |
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401 | return; |
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402 | } |
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403 | |
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404 | while ( Ring_buffer_Is_full( &TX_Buffer[ port ] ) ); |
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405 | |
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406 | Ring_buffer_Add_character( &TX_Buffer[ port ], ch ); |
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407 | } |
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408 | |
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409 | #endif /* CONSOLE_USE_INTERRUPTS */ |
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410 | |
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411 | /* |
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412 | * DEBUG_puts |
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413 | * |
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414 | * This should be safe in the event of an error. It attempts to insure |
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415 | * that no TX empty interrupts occur while it is doing polled IO. Then |
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416 | * it restores the state of that external interrupt. |
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417 | * |
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418 | * Input parameters: |
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419 | * string - pointer to debug output string |
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420 | * |
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421 | * Output parameters: NONE |
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422 | * |
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423 | * Return values: NONE |
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424 | */ |
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425 | |
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426 | void DEBUG_puts( |
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427 | char *string |
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428 | ) |
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429 | { |
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430 | char *s; |
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431 | unsigned32 old_level; |
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432 | |
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433 | ERC32_Disable_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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434 | for ( s = string ; *s ; s++ ) |
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435 | console_outbyte_polled( 0, *s ); |
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436 | |
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437 | console_outbyte_polled( 0, '\r' ); |
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438 | console_outbyte_polled( 0, '\n' ); |
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439 | ERC32_Restore_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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440 | } |
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441 | |
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442 | |
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443 | /* |
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444 | * console_open |
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445 | * |
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446 | * This routine is the console device driver open entry point. |
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447 | * |
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448 | * Input parameters: |
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449 | * major - console device major number |
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450 | * minor - console device minor number |
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451 | * arg - pointer to optional device driver arguments |
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452 | * |
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453 | * Output parameters: NONE |
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454 | * |
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455 | * Return values: |
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456 | * rtems_device_driver status code |
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457 | */ |
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458 | |
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459 | rtems_device_driver console_open( |
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460 | rtems_device_major_number major, |
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461 | rtems_device_minor_number minor, |
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462 | void * arg |
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463 | ) |
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464 | { |
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465 | return RTEMS_SUCCESSFUL; |
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466 | } |
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467 | |
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468 | /* |
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469 | * console_close |
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470 | * |
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471 | * This routine is the console device driver close entry point. |
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472 | * |
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473 | * Input parameters: |
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474 | * major - console device major number |
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475 | * minor - console device minor number |
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476 | * arg - pointer to optional device driver arguments |
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477 | * |
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478 | * Output parameters: NONE |
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479 | * |
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480 | * Return values: |
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481 | * rtems_device_driver status code |
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482 | */ |
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483 | |
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484 | rtems_device_driver console_close( |
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485 | rtems_device_major_number major, |
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486 | rtems_device_minor_number minor, |
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487 | void * arg |
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488 | ) |
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489 | { |
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490 | return RTEMS_SUCCESSFUL; |
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491 | } |
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492 | |
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493 | /* |
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494 | * console_read |
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495 | * |
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496 | * This routine is the console device driver read entry point. |
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497 | * |
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498 | * Input parameters: |
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499 | * major - console device major number |
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500 | * minor - console device minor number |
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501 | * arg - pointer to optional device driver arguments |
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502 | * |
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503 | * Output parameters: NONE |
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504 | * |
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505 | * Return values: |
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506 | * rtems_device_driver status code |
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507 | * |
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508 | * NOTE: Read bytes from the serial port. We only have stdin. |
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509 | */ |
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510 | |
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511 | rtems_device_driver console_read( |
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512 | rtems_device_major_number major, |
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513 | rtems_device_minor_number minor, |
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514 | void * arg |
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515 | ) |
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516 | { |
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517 | rtems_libio_rw_args_t *rw_args; |
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518 | char *buffer; |
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519 | int maximum; |
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520 | int count = 0; |
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521 | |
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522 | rw_args = (rtems_libio_rw_args_t *) arg; |
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523 | |
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524 | buffer = rw_args->buffer; |
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525 | maximum = rw_args->count; |
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526 | |
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527 | for (count = 0; count < maximum; count++) { |
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528 | buffer[ count ] = INBYTE( minor ); |
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529 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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530 | buffer[ count++ ] = '\n'; |
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531 | break; |
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532 | } |
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533 | } |
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534 | |
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535 | rw_args->bytes_moved = count; |
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536 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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537 | } |
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538 | |
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539 | /* |
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540 | * console_write |
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541 | * |
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542 | * This routine is the console device driver write entry point. |
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543 | * |
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544 | * Input parameters: |
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545 | * major - console device major number |
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546 | * minor - console device minor number |
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547 | * arg - pointer to optional device driver arguments |
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548 | * |
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549 | * Output parameters: NONE |
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550 | * |
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551 | * Return values: |
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552 | * rtems_device_driver status code |
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553 | * |
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554 | * NOTE: Write bytes to the serial port. Stdout and stderr are the same. |
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555 | */ |
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556 | |
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557 | rtems_device_driver console_write( |
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558 | rtems_device_major_number major, |
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559 | rtems_device_minor_number minor, |
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560 | void * arg |
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561 | ) |
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562 | { |
---|
563 | int count; |
---|
564 | int maximum; |
---|
565 | rtems_libio_rw_args_t *rw_args; |
---|
566 | char *buffer; |
---|
567 | |
---|
568 | rw_args = (rtems_libio_rw_args_t *) arg; |
---|
569 | |
---|
570 | buffer = rw_args->buffer; |
---|
571 | maximum = rw_args->count; |
---|
572 | |
---|
573 | for (count = 0; count < maximum; count++) { |
---|
574 | OUTBYTE( minor, buffer[ count ] ); |
---|
575 | if ( buffer[ count ] == '\n') { |
---|
576 | OUTBYTE( minor, '\r'); |
---|
577 | } |
---|
578 | } |
---|
579 | |
---|
580 | rw_args->bytes_moved = maximum; |
---|
581 | return RTEMS_SUCCESSFUL; |
---|
582 | } |
---|
583 | |
---|
584 | /* |
---|
585 | * console_control |
---|
586 | * |
---|
587 | * This routine is the console device driver control entry point. |
---|
588 | * |
---|
589 | * Input parameters: |
---|
590 | * major - console device major number |
---|
591 | * minor - console device minor number |
---|
592 | * arg - pointer to optional device driver arguments |
---|
593 | * |
---|
594 | * Output parameters: NONE |
---|
595 | * |
---|
596 | * Return values: |
---|
597 | * rtems_device_driver status code |
---|
598 | */ |
---|
599 | |
---|
600 | rtems_device_driver console_control( |
---|
601 | rtems_device_major_number major, |
---|
602 | rtems_device_minor_number minor, |
---|
603 | void * arg |
---|
604 | ) |
---|
605 | { |
---|
606 | return RTEMS_SUCCESSFUL; |
---|
607 | } |
---|
608 | |
---|